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- #!/usr/bin/env bash
- # Compresses PNG files to lower file sizes
- # Results are comparable to compressor.io etc.
- # License: CC0
- # Usage:
- # - Make sure to chmod +x compresspng.sh
- # - compresspng.sh /path/to/somefile.png
- # Result will be saved as: /path/to/compressed_somefile.png
- # Ref: http://www.ffnn.nl/pages/articles/media/png-optimization.php
- [ -z "$(command -v convert)" ] && echo 'Error: convert binary missing. Please install ImageMagick.' && exit 1
- [ -z "$(command -v optipng)" ] && echo 'Error: optipng binary missing. Please install optipng.' && exit 2
- _input_dir="$(dirname $1)"
- _input_filename="$(basename $1)"
- # Convert to indexed color space
- convert -quality 0 +dither -colors 256 "$1" "$_input_dir/compressed_${_input_filename}"
- # Compress even more with optipng
- optipng -zc1-9 -zm1-9 -zs0-2 -f0-5 -out "$_input_dir/compressed_${_input_filename}" "$_input_dir/compressed_${_input_filename}"
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